Before this series got started there were lots of rumors that it was going to involve time travel and multi-verses.
I'm SO glad that this hasn't happened yet on the show.
I'm hoping that the "new galaxy" means:
"We can *ignore* the sequel trilogy because the REAL action is going to be going on over in the other galaxy while the good guys are fighting against Raised By Wolves - style Lovecraftian Horror planets. All while the stupid First Order/New Republic folks are totally unaware that their conflict is totally meaningless compared to the threat of the extinction of all life from Force-powered demons."